<nz-card style="margin:24px;min-height: 360px;">
  <p>
    web-im works!
  </p>
  <button nz-button nzType="primary" (click)="btnClick()">登录</button>
  <button nz-button nzType="primary" (click)="btnMessage()">发送消息</button>
</nz-card>